Çичкĕтеслĕх
Çичкĕтеслĕх, е гептагон — çичĕ енлĕ тата çичĕ кĕтеслĕ нумайкĕтеслĕх.

Вуламалли 
Гептагон // Большой словарь иностранных слов.- Издательство «ИДДК», 2007.
Horton, J. D. (1983), Sets with no empty convex 7-gons, Canadian Mathematical Bulletin Т. 26 (4): 482–484

Каçăсем

 Definition and properties of a heptagon With interactive animation
 Heptagon according Johnson
 Another approximate construction method
 Polygons – Heptagons
 Recently discovered and highly accurate approximation for the construction of a regular heptagon.
 Heptagon, an approximating construction as an animation
 A heptagon with a given side, an approximating construction as an animation

Нумайкĕтеслĕхсем
7 (хисеп)
Планиметри